class_docstr: Tag object associated with a model version.
code: def to_proto(self):
      tag = ProtoModelVersionTag()
      tag.key = self.key
      tag.value = self.value
      return tag
  
file_path: mlflow/mlflow/entities/model_registry/model_version_tag.py
imports: from mlflow.entities.model_registry._model_registry_entity import _ModelRegistryEntity
  from mlflow.protos.model_registry_pb2 import ModelVersionTag
label_desc: Use image node_id 6 for calling the ModelVersionTag obj's underlying member method code with example usage: obj.to_proto() and returns: tag